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v2.4.1.9

Borrowings - Summary of Mortgage Note Payable and Line of Credit (Parenthetical) (Detail) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Mortgage Note Payable [Member] | MetLife [Member] |  |
Debt Instrument [Line Items] |  |
Effective interest rate percentage | 3.61%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LineOfCreditFacilityAxis = land_MetlifeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |
Remaining availability | $ 7,500,000 land_LongTermDebtAdditionalAvailableAmount / us-gaap_LineOfCreditFacilityAxis = land_MetlifeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember | $ 13,800,000 land_LongTermDebtAdditionalAvailableAmount / us-gaap_LineOfCreditFacilityAxis = land_MetlifeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
Line of Credit [Member] | MetLife [Member] |  |
Debt Instrument [Line Items] |  |
Remaining availability | 7,500,000 land_LongTermDebtAdditionalAvailableAmount / us-gaap_LineOfCreditFacilityAxis = land_MetlifeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 13,800,000 land_LongTermDebtAdditionalAvailableAmount / us-gaap_LineOfCreditFacilityAxis = land_MetlifeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Mortgage Notes Payable [Member] | Farm Credit [Member] |  |
Debt Instrument [Line Items] |  |
Effective interest rate percentage | 12.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LineOfCreditFacilityAxis = land_FarmCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 12.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LineOfCreditFacilityAxis = land_FarmCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Bond Payable [Member] | Farmer Mac [Member] |  |
Debt Instrument [Line Items] |  |
Remaining availability | $ 0 land_LongTermDebtAdditionalAvailableAmount / us-gaap_LineOfCreditFacilityAxis = land_FarmerMacMember / us-gaap_LongtermDebtTypeAxis = land_BondsPayableMember | $ 0 land_LongTermDebtAdditionalAvailableAmount / us-gaap_LineOfCreditFacilityAxis = land_FarmerMacMember / us-gaap_LongtermDebtTypeAxis = land_BondsPayableMember

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- Definition Long Term Debt Additional Available Amount + References No definition available. + Details
Name: | land_LongTermDebtAdditionalAvailableAmount
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=land_BondsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |